My 1999 E55 brake pedal has always required upwards of 2 inches of pedal travel before braking power is felt. I had the brake booster replaced and the brakes bled as well as new pads. Recently, I pulled the wheel to inspect. I noticed that I could spin the front rotor without any pad pressure whatsoever on the disk. Normally, in our cars, when spinning the rotors, a certain amount of friction is sensed by basis of a slight pad pressure being exerted. This is because, after a normal braking operation, the caliper pistons move back only so slightly, but essentially keep the pad up tight against the rotor. My E55 seems to retract the piston after a braking operation. Thus, when I press the pedal, it has to make up that distance, first, before brake activation. What could be the remedy for this? Is it possible that the booster is reversing fluid pressure after a braking operation and causing the pistons to retract slightly? I'm baffled. Thanks for your help JB
88 300E 99 E55- posted
17 years ago